Process for producing reenforced waterproof compositions



1,644,050 1927' w. H. CADY PROCESS FOR PRODUCING REENFORCED WATERPROOF COMPOSITIONS Filed Nov. '7, 1921 ,Zi? 7/??? far. 21/711 ta rj 6061 (yaw MM 7 Patented Oct. 4, 1927.

UNITED STATES WALTER H. GADY, OF BOSTON, MASSACHUSETTS PROCESS FOR PRODUCING REENFOROED/WATEBPROOF COMPOSITIONS.

Application filed November 'f, 1921. Serial No. 513,383.

'This invention relates to a process for producing 'reenforced waterproof composltions and refers more partlcularly to the production of a waterproofed composition which is reenforced by means of thread,

string, wood fibre or other strengthening material which is laid or fed between the plies of the composition to produce a strengthening effect. I

Among the salient objects. of the invention are to provide a process in which plies or layers of paper, felt, or any other type of stock which may be built up in plies to form a unitary structure, is reenforced or strengthened by positioning thread, string, hemp oranyother ganic or inorganic in form which will make the inherent quality of the composition less liable to tear or become disrupted due to the lack of binding quality of the stock or adhesive material used in the production thereof; to provide a process in which fibrous material in the form of thread, twine or metal substance maybe either woven or placed between the plies of the substance to produce this reenforcing eifect.

Fig. 1 is a perspect've view of the product with the upper ply broken away to show the reenforcing cords.

Fig. 2 is a perspective view of a modified form of construction in which the upper and lower pliesare devoid of any bituminous or asphaltic material.

- In the forming of paper, particularly the heavier papers such as building material or paper for sacks or that used for other commer'cial purposes, there is required a stock supplied principally by kraft paper which is tough and difficult to tear. Kraft paper, while yery satisfactory for some purposes, has not the strength required and is limited by the expense of the paper stock from which it is produced. The product disclosed in this invention supplies a sheeted material -which is given strength by fibres which are woven or positioned in the body of the material so as to produce a strong durable sheet having the characteristics of cloth and less liable to tear as is the paper now commonly used for industrial urposes.

In the building indust as well as numerous other industries w ere a very cheap grade of aper is used, the paper is of a poor quality-and will not stand up a ainst hard usage nor will its strength permit the carrying of heavy weights due to the structype of fiber, either orture of the paper which is loose and easily pulled apart.

The production of the product herein disclosed refers.more particularly to a waterproof composition in' which the waterproofing substances such as asphalts or other bituminous substances are incorporated intothe paper during its making in a nonadhesive dispersedform. The paper stock is first produced in the usual manner comprising any desired material such as rags, paper or other pulpy substance used in the paper making industry. To this is added a combination of asphalt, clay and water which have been mixed in predetermined form so that the asphalt or any other desired bituminous substance which is to vbe used to waterproof the paper, is thoroughly mixed until it combines with the water and clay to form a nonadhesive emulsion with the bituminous emulsion material in a finely dispersed form and forming the internal or dispersed phase I of the emulsion, the water and clay forming enveloping films thereabout. This emulsion is mixed with the paper stock and is run over the paper machine in the usual manner to produce the sheeted material. There may be produced a plurality of plies which are united on a multi-cylinder machine to form a built-up unitary structure. Inv certain cases, the sheet may be built up of outer plies, consisting of the plain paper stock while the inner plies contain the waterproof- .ing material. Besides this, numerous other combinations of the built up plies may be produced to form any desirable character of paper sheet.

In the building up of the sheet, that is, just prior to the combining of the plies as they come from the separate rolls of the machine and are combined upon the blanket, there isfed therebetween fibres or strengthening twine of organic or inorganic material which "is positioned between the plies lon- 'gitudinally and transversely of the sheet as 15 the warp and woof in the textile industry. The longitudinal or war fibres may be laid upon the lies from bal s or reeled from a spindle w ile the transverse fibre may be positioned across the 'longitudinal strengthening material in the form of short lengths by means of a shuttle. The latter method, while being somewhat more expensive, would produce a sheet of greater strength. These plies are then combined to form a single sheet, which, due to the strengthening material incorporated in the body of the sheet material, .improves the quality and durability of the sheeted substance. This use of strengthening fibres in the sheet is particularly adapted to paper which is made from a poor grade of stock but incorporated in any tyfpe of paper will improve the strength 0 the material. g It is understood that this strengthening material may be used in the production of all types of paper including that made from rags, felt, wood pulp and old paper stock and besides, the paper produced from combinations of the above with sulphite, paper and also in the production of Waterproof papers and .,.wate rproof. felted substances, where the sheetedmaterial produced is built up from two ormore plies.

In the making of a reenforced product of this type, the string is not introduced after the completion of the product but the strengthening fibre or fibrous material is inane-4,050

) of said plies.

corporated in the body of the paper itself during the forming or felting operation, 1n-

corporating the strengthening substance into I the paper as a unit. Further, this incorporation of the strengthening fibres with the paperstock is distinguished from the old process where two pieces of paper arepasted or glued together, the strengthening material being placed between the plies during the uniting-of the plies.

I claim as my-invention:

A process of producing a reenforced sheet- I ed material consisting in simultaneously incorporating a waterproofing substance in the body of'felted plies during the felting incorporating continuous strengthening fibrouscords extending longijtudinally and transversely of the plies during the combination of the plies into a unitary structure.

' WALTER H. CADY. 

